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Finding the Fourth Proportional to 91,221.80, 136,602.30 and 72,789.80

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Solution

The fourth proportional to 91,221.80, 136,602.30 and 72,789.80 is: 109,000.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,221.80 : 136,602.30 = 72,789.80 : x
  2. Step 2: Convert to fraction form
    91,221.80/136,602.30 = 72,789.80/x
  3. Step 3: Cross multiply
    91,221.80x = 136,602.30 × 72,789.80
  4. Step 4: Simplify right side
    91,221.80x = 9,943,254,096.54
  5. Step 5: Solve for x
    x = 9,943,254,096.54/91,221.80
  6. Step 6: Final answer
    x = 109,000.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.